I have one remote SMTP server I want to relay mail through, but connect to it using differing credentials based on sender; using Postfix 2.3
My relevant main.cf is: relayhost = smtp_sender_dependent_authentication = yes sender_dependent_relayhost_maps = hash:/etc/postfix/relayhost_maps #sender_dependent_default_transport_maps = hash:/etc/postfix/transport smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_mechanism_filter = AUTH LOGIN smtp_sasl_security_options = relayhost_maps: @company-a.com [secure.mailrelay.com] @company-b.com [secure.mailrelay.com] sasl_passwd: @company-a.com u...@company-a.com:passwordA
